Unable to get current location to set center of map

Unable to get current location to set center of map

I'm learning to use map and my objective is to display current location on
the map when the application first load, instead of showing the map of the
world. But I can't get it to focus on the location as wanted as
coordinates that I've got are all 0.
Note:
I've set in Xcode the default location as Tokyo, Japan.
All codes are in viewDidLoad
I'm using Simulator
I've tried using 2 approaches.
Approach A) I set showsUserLocation as YES. Then set center of the map to
value from map's userLocation. But the user location is null, latitutude
and longitude are 0.000000.
Approach B) I create location manager and get latitude and longitude from
it. Also getting latitude and longitude are 0.000000.
Below is the code:
ViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
@interface ViewController : UIViewController <MKMapViewDelegate>
@property (weak, nonatomic) IBOutlet MKMapView *myMap;
@property CLLocationManager *locationManager;
@end
ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//Approach A)
self.myMap.showsUserLocation = YES; //tokyo Japan, blue pin with
ripple displays on Default Location that I set in XCode = Tokyo, Japan
NSLog(@"using MapView.userLocation, user location = %@",
self.myMap.userLocation.location); //output = null
NSLog(@"using MapView.userLocation, latitude = %f",
self.myMap.userLocation.location.coordinate.latitude); //output =
0.000000
NSLog(@"using MapView.userLocation, longitude = %f",
self.myMap.userLocation.location.coordinate.longitude); //output =
0.000000
CLLocationCoordinate2D centerCoord =
{self.myMap.userLocation.location.coordinate.latitude,
self.myMap.userLocation.location.coordinate.longitude};
[self.myMap setCenterCoordinate:centerCoord animated:TRUE]; //nothing
happens, as latitude and longitude = 0.000000
//Approach B)
// create the location manager
CLLocationManager *locationManager;
if (nil == self.locationManager) {
self.locationManager = [[CLLocationManager alloc] init];
}
self.locationManager.distanceFilter = kCLDistanceFilterNone; //
whenever we move
self.locationManager.desiredAccuracy =
kCLLocationAccuracyHundredMeters; // 100 m
[self.locationManager startUpdatingLocation];
NSLog(@"using LocationManager:current location latitude = %f,
longtitude = %f", self.locationManager.location.coordinate.latitude,
self.locationManager.location.coordinate.longitude);
//if getting latitude and longitude, will call "setCenterCoordinate"
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
Output:
xxxx using MapView.userLocation, user location = (null)
xxxx using MapView.userLocation, latitude = 0.000000
xxxx using MapView.userLocation, longitude = 0.000000
xxxx using LocationManager:current location latitude = 0.000000,
longtitude = 0.000000